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rearranged code, resize fixed.
[st.git] / st.c
1 /* See LICENSE for licence details. */
2 #define _XOPEN_SOURCE 600
3 #include <ctype.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <limits.h>
7 #include <locale.h>
8 #include <stdarg.h>
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <string.h>
12 #include <signal.h>
13 #include <sys/ioctl.h>
14 #include <sys/select.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <unistd.h>
19 #include <X11/Xlib.h>
20 #include <X11/keysym.h>
21 #include <X11/Xutil.h>
22
23 #define TNAME "xterm"
24
25 /* Arbitrary sizes */
26 #define ESC_TITLE_SIZ 256
27 #define ESC_BUF_SIZ 256
28 #define ESC_ARG_SIZ 16
29 #define DRAW_BUF_SIZ 1024
30
31 #define SERRNO strerror(errno)
32 #define MIN(a, b) ((a) < (b) ? (a) : (b))
33 #define MAX(a, b) ((a) < (b) ? (b) : (a))
34 #define LEN(a) (sizeof(a) / sizeof(a[0]))
35 #define DEFAULT(a, b) (a) = (a) ? (a) : (b)
36 #define BETWEEN(x, a, b) ((a) <= (x) && (x) <= (b))
37 #define LIMIT(x, a, b) (x) = (x) < (a) ? (a) : (x) > (b) ? (b) : (x)
38 #define ATTRCMP(a, b) ((a).mode != (b).mode || (a).fg != (b).fg || (a).bg != (b).bg)
39
40 /* Attribute, Cursor, Character state, Terminal mode, Screen draw mode */
41 enum { ATTR_NULL=0 , ATTR_REVERSE=1 , ATTR_UNDERLINE=2, ATTR_BOLD=4, ATTR_GFX=8 };
42 enum { CURSOR_UP, CURSOR_DOWN, CURSOR_LEFT, CURSOR_RIGHT, CURSOR_HIDE, CURSOR_DRAW, CURSOR_SAVE, CURSOR_LOAD };
43 enum { GLYPH_SET=1, GLYPH_DIRTY=2 };
44 enum { MODE_WRAP=1, MODE_INSERT=2, MODE_APPKEYPAD=4 };
45 enum { ESC_START=1, ESC_CSI=2, ESC_OSC=4, ESC_TITLE=8, ESC_ALTCHARSET=16 };
46 enum { SCREEN_UPDATE, SCREEN_REDRAW };
47
48 typedef struct {
49 char c; /* character code */
50 char mode; /* attribute flags */
51 int fg; /* foreground */
52 int bg; /* background */
53 char state; /* state flags */
54 } Glyph;
55
56 typedef Glyph* Line;
57
58 typedef struct {
59 Glyph attr; /* current char attributes */
60 int x;
61 int y;
62 } TCursor;
63
64 /* CSI Escape sequence structs */
65 /* ESC '[' [[ [<priv>] <arg> [;]] <mode>] */
66 typedef struct {
67 char buf[ESC_BUF_SIZ]; /* raw string */
68 int len; /* raw string length */
69 char priv;
70 int arg[ESC_ARG_SIZ];
71 int narg; /* nb of args */
72 char mode;
73 } CSIEscape;
74
75 /* Internal representation of the screen */
76 typedef struct {
77 int row; /* nb row */
78 int col; /* nb col */
79 Line* line; /* screen */
80 TCursor c; /* cursor */
81 char hidec;
82 int top; /* top scroll limit */
83 int bot; /* bottom scroll limit */
84 int mode; /* terminal mode flags */
85 int esc; /* escape state flags */
86 char title[ESC_TITLE_SIZ];
87 int titlelen;
88 } Term;
89
90 /* Purely graphic info */
91 typedef struct {
92 Display* dis;
93 Window win;
94 Pixmap buf;
95 int scr;
96 int w; /* window width */
97 int h; /* window height */
98 int bufw; /* pixmap width */
99 int bufh; /* pixmap height */
100 int ch; /* char height */
101 int cw; /* char width */
102 } XWindow;
103
104 typedef struct {
105 KeySym k;
106 char s[ESC_BUF_SIZ];
107 } Key;
108
109 #include "config.h"
110
111 /* Drawing Context */
112 typedef struct {
113 unsigned long col[LEN(colorname)];
114 XFontStruct* font;
115 XFontStruct* bfont;
116 GC gc;
117 } DC;
118
119 static void die(const char *errstr, ...);
120 static void draw(int);
121 static void execsh(void);
122 static void sigchld(int);
123 static void run(void);
124
125 static void csidump(void);
126 static void csihandle(void);
127 static void csiparse(void);
128 static void csireset(void);
129
130 static void tclearregion(int, int, int, int);
131 static void tcursor(int);
132 static void tmovecursor(int);
133 static void tdeletechar(int);
134 static void tdeleteline(int);
135 static void tinsertblank(int);
136 static void tinsertblankline(int);
137 static void tmoveto(int, int);
138 static void tnew(int, int);
139 static void tnewline(void);
140 static void tputc(char);
141 static void tputs(char*, int);
142 static void treset(void);
143 static void tresize(int, int);
144 static void tscroll(void);
145 static void tscrollup(int);
146 static void tscrolldown(int);
147 static void tsetattr(int*, int);
148 static void tsetchar(char);
149 static void tsetscroll(int, int);
150
151 static void ttynew(void);
152 static void ttyread(void);
153 static void ttyresize(int, int);
154 static void ttywrite(const char *, size_t);
155
156 static unsigned long xgetcol(const char *);
157 static void xclear(int, int, int, int);
158 static void xcursor(int);
159 static void xinit(void);
160
161 static void expose(XEvent *);
162 static char* kmap(KeySym);
163 static void kpress(XEvent *);
164 static void resize(XEvent *);
165
166 static void (*handler[LASTEvent])(XEvent *) = {
167 [KeyPress] = kpress,
168 [Expose] = expose,
169 [ConfigureNotify] = resize
170 };
171
172 /* Globals */
173 static DC dc;
174 static XWindow xw;
175 static Term term;
176 static CSIEscape escseq;
177 static int cmdfd;
178 static pid_t pid;
179 static int running;
180
181 #ifdef DEBUG
182 void
183 tdump(void) {
184 int row, col;
185 Glyph c;
186
187 for(row = 0; row < term.row; row++) {
188 for(col = 0; col < term.col; col++) {
189 if(col == term.c.x && row == term.c.y)
190 putchar('#');
191 else {
192 c = term.line[row][col];
193 putchar(c.state & GLYPH_SET ? c.c : '.');
194 }
195 }
196 putchar('\n');
197 }
198 }
199 #endif
200
201 void
202 die(const char *errstr, ...) {
203 va_list ap;
204
205 va_start(ap, errstr);
206 vfprintf(stderr, errstr, ap);
207 va_end(ap);
208 exit(EXIT_FAILURE);
209 }
210
211 void
212 execsh(void) {
213 char *args[3] = {getenv("SHELL"), "-i", NULL};
214 DEFAULT(args[0], "/bin/sh"); /* default shell if getenv() failed */
215 putenv("TERM=" TNAME);
216 execvp(args[0], args);
217 }
218
219 void
220 xbell(void) { /* visual bell */
221 XRectangle r = { BORDER, BORDER, xw.bufw, xw.bufh };
222 XSetForeground(xw.dis, dc.gc, dc.col[BellCol]);
223 XFillRectangles(xw.dis, xw.win, dc.gc, &r, 1);
224 /* usleep(30000); */
225 draw(SCREEN_REDRAW);
226 }
227
228 void
229 sigchld(int a) {
230 int stat = 0;
231 if(waitpid(pid, &stat, 0) < 0)
232 die("Waiting for pid %hd failed: %s\n", pid, SERRNO);
233 if(WIFEXITED(stat))
234 exit(WEXITSTATUS(stat));
235 else
236 exit(EXIT_FAILURE);
237 }
238
239 void
240 ttynew(void) {
241 int m, s;
242 char *pts;
243
244 if((m = posix_openpt(O_RDWR | O_NOCTTY)) < 0)
245 die("openpt failed: %s\n", SERRNO);
246 if(grantpt(m) < 0)
247 die("grandpt failed: %s\n", SERRNO);
248 if(unlockpt(m) < 0)
249 die("unlockpt failed: %s\n", SERRNO);
250 if(!(pts = ptsname(m)))
251 die("ptsname failed: %s\n", SERRNO);
252 if((s = open(pts, O_RDWR | O_NOCTTY)) < 0)
253 die("Couldn't open slave: %s\n", SERRNO);
254 fcntl(s, F_SETFL, O_NDELAY);
255 switch(pid = fork()) {
256 case -1:
257 die("fork failed\n");
258 break;
259 case 0:
260 setsid(); /* create a new process group */
261 dup2(s, STDIN_FILENO);
262 dup2(s, STDOUT_FILENO);
263 dup2(s, STDERR_FILENO);
264 if(ioctl(s, TIOCSCTTY, NULL) < 0)
265 die("ioctl TTIOCSTTY failed: %s\n", SERRNO);
266 execsh();
267 break;
268 default:
269 close(s);
270 cmdfd = m;
271 signal(SIGCHLD, sigchld);
272 }
273 }
274
275 void
276 dump(char c) {
277 static int col;
278 fprintf(stderr, " %02x '%c' ", c, isprint(c)?c:'.');
279 if(++col % 10 == 0)
280 fprintf(stderr, "\n");
281 }
282
283 void
284 ttyread(void) {
285 char buf[BUFSIZ] = {0};
286 int ret;
287
288 if((ret = read(cmdfd, buf, BUFSIZ)) < 0)
289 die("Couldn't read from shell: %s\n", SERRNO);
290 else
291 tputs(buf, ret);
292 }
293
294 void
295 ttywrite(const char *s, size_t n) {
296 if(write(cmdfd, s, n) == -1)
297 die("write error on tty: %s\n", SERRNO);
298 }
299
300 void
301 ttyresize(int x, int y) {
302 struct winsize w;
303
304 w.ws_row = term.row;
305 w.ws_col = term.col;
306 w.ws_xpixel = w.ws_ypixel = 0;
307 if(ioctl(cmdfd, TIOCSWINSZ, &w) < 0)
308 fprintf(stderr, "Couldn't set window size: %s\n", SERRNO);
309 }
310
311 void
312 tcursor(int mode) {
313 static TCursor c;
314
315 if(mode == CURSOR_SAVE)
316 c = term.c;
317 else if(mode == CURSOR_LOAD)
318 term.c = c, tmoveto(c.x, c.y);
319 }
320
321 void
322 treset(void) {
323 term.c.attr.mode = ATTR_NULL;
324 term.c.attr.fg = DefaultFG;
325 term.c.attr.bg = DefaultBG;
326 term.c.x = term.c.y = 0;
327 term.hidec = 0;
328 term.top = 0, term.bot = term.row - 1;
329 term.mode = MODE_WRAP;
330 tclearregion(0, 0, term.col-1, term.row-1);
331 }
332
333 void
334 tnew(int col, int row) { /* screen size */
335 term.row = row, term.col = col;
336 term.top = 0, term.bot = term.row - 1;
337 /* mode */
338 term.mode = MODE_WRAP;
339 /* cursor */
340 term.c.attr.mode = ATTR_NULL;
341 term.c.attr.fg = DefaultFG;
342 term.c.attr.bg = DefaultBG;
343 term.c.x = term.c.y = 0;
344 term.hidec = 0;
345 /* allocate screen */
346 term.line = calloc(term.row, sizeof(Line));
347 for(row = 0 ; row < term.row; row++)
348 term.line[row] = calloc(term.col, sizeof(Glyph));
349 }
350
351 /* TODO: Replace with scrollup/scolldown */
352 void
353 tscroll(void) {
354 Line temp = term.line[term.top];
355 int i;
356
357 for(i = term.top; i < term.bot; i++)
358 term.line[i] = term.line[i+1];
359 memset(temp, 0, sizeof(Glyph) * term.col);
360 term.line[term.bot] = temp;
361 }
362
363 void
364 tscrolldown (int n) {
365 int i;
366 Line temp;
367
368 LIMIT(n, 0, term.bot-term.top+1);
369
370 for(i = 0; i < n; i++)
371 memset(term.line[term.bot-i], 0, term.col*sizeof(Glyph));
372
373 for(i = term.bot; i >= term.top+n; i--) {
374 temp = term.line[i];
375 term.line[i] = term.line[i-n];
376 term.line[i-n] = temp;
377 }
378 }
379
380 void
381 tscrollup (int n) {
382 int i;
383 Line temp;
384 LIMIT(n, 0, term.bot-term.top+1);
385
386 for(i = 0; i < n; i++)
387 memset(term.line[term.top+i], 0, term.col*sizeof(Glyph));
388
389 for(i = term.top; i <= term.bot-n; i++) {
390 temp = term.line[i];
391 term.line[i] = term.line[i+n];
392 term.line[i+n] = temp;
393 }
394 }
395
396 void
397 tnewline(void) {
398 int y = term.c.y + 1;
399 if(y > term.bot)
400 tscroll(), y = term.bot;
401 tmoveto(0, y);
402 }
403
404 void
405 csiparse(void) {
406 /* int noarg = 1; */
407 char *p = escseq.buf;
408
409 escseq.narg = 0;
410 if(*p == '?')
411 escseq.priv = 1, p++;
412
413 while(p < escseq.buf+escseq.len) {
414 while(isdigit(*p)) {
415 escseq.arg[escseq.narg] *= 10;
416 escseq.arg[escseq.narg] += *p++ - '0'/*, noarg = 0 */;
417 }
418 if(*p == ';' && escseq.narg+1 < ESC_ARG_SIZ)
419 escseq.narg++, p++;
420 else {
421 escseq.mode = *p;
422 escseq.narg++;
423 return;
424 }
425 }
426 }
427
428 void
429 tmoveto(int x, int y) {
430 term.c.x = x < 0 ? 0 : x >= term.col ? term.col-1 : x;
431 term.c.y = y < 0 ? 0 : y >= term.row ? term.row-1 : y;
432 }
433
434 void
435 tmovecursor(int dir) {
436 int xf = term.c.x, yf = term.c.y;
437
438 switch(dir) {
439 case CURSOR_UP:
440 yf--;
441 break;
442 case CURSOR_DOWN:
443 yf++;
444 break;
445 case CURSOR_LEFT:
446 xf--;
447 if(term.mode & MODE_WRAP && xf < 0) {
448 xf = term.col-1, yf--;
449 if(yf < term.top)
450 yf = term.top, xf = 0;
451 }
452 break;
453 case CURSOR_RIGHT:
454 xf++;
455 if(term.mode & MODE_WRAP && xf >= term.col) {
456 xf = 0, yf++;
457 if(yf > term.bot)
458 yf = term.bot, tscroll();
459 }
460 break;
461 }
462 tmoveto(xf, yf);
463 }
464
465 void
466 tsetchar(char c) {
467 term.line[term.c.y][term.c.x] = term.c.attr;
468 term.line[term.c.y][term.c.x].c = c;
469 term.line[term.c.y][term.c.x].state |= GLYPH_SET;
470 }
471
472 void
473 tclearregion(int x1, int y1, int x2, int y2) {
474 int y, temp;
475
476 if(x1 > x2)
477 temp = x1, x1 = x2, x2 = temp;
478 if(y1 > y2)
479 temp = y1, y1 = y2, y2 = temp;
480
481 LIMIT(x1, 0, term.col-1);
482 LIMIT(x2, 0, term.col-1);
483 LIMIT(y1, 0, term.row-1);
484 LIMIT(y2, 0, term.row-1);
485
486 for(y = y1; y <= y2; y++)
487 memset(&term.line[y][x1], 0, sizeof(Glyph)*(x2-x1+1));
488 }
489
490 void
491 tdeletechar(int n) {
492 int src = term.c.x + n;
493 int dst = term.c.x;
494 int size = term.col - src;
495
496 if(src >= term.col) {
497 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
498 return;
499 }
500 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
501 tclearregion(term.col-size, term.c.y, term.col-1, term.c.y);
502 }
503
504 void
505 tinsertblank(int n) {
506 int src = term.c.x;
507 int dst = src + n;
508 int size = term.col - n - src;
509
510 if(dst >= term.col) {
511 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
512 return;
513 }
514 memmove(&term.line[term.c.y][dst], &term.line[term.c.y][src], size * sizeof(Glyph));
515 tclearregion(src, term.c.y, dst, term.c.y);
516 }
517
518 void
519 tinsertblankline(int n) {
520 int i;
521 Line blank;
522 int bot = term.bot;
523
524 if(term.c.y > term.bot)
525 bot = term.row - 1;
526 else if(term.c.y < term.top)
527 bot = term.top - 1;
528 if(term.c.y + n >= bot) {
529 tclearregion(0, term.c.y, term.col-1, bot);
530 return;
531 }
532 for(i = bot; i >= term.c.y+n; i--) {
533 /* swap deleted line <-> blanked line */
534 blank = term.line[i];
535 term.line[i] = term.line[i-n];
536 term.line[i-n] = blank;
537 /* blank it */
538 memset(blank, 0, term.col * sizeof(Glyph));
539 }
540 }
541
542 void
543 tdeleteline(int n) {
544 int i;
545 Line blank;
546 int bot = term.bot;
547
548 if(term.c.y > term.bot)
549 bot = term.row - 1;
550 else if(term.c.y < term.top)
551 bot = term.top - 1;
552 if(term.c.y + n >= bot) {
553 tclearregion(0, term.c.y, term.col-1, bot);
554 return;
555 }
556 for(i = term.c.y; i <= bot-n; i++) {
557 /* swap deleted line <-> blanked line */
558 blank = term.line[i];
559 term.line[i] = term.line[i+n];
560 term.line[i+n] = blank;
561 /* blank it */
562 memset(blank, 0, term.col * sizeof(Glyph));
563 }
564 }
565
566 void
567 tsetattr(int *attr, int l) {
568 int i;
569
570 for(i = 0; i < l; i++) {
571 switch(attr[i]) {
572 case 0:
573 term.c.attr.mode &= ~(ATTR_REVERSE | ATTR_UNDERLINE | ATTR_BOLD);
574 term.c.attr.fg = DefaultFG;
575 term.c.attr.bg = DefaultBG;
576 break;
577 case 1:
578 term.c.attr.mode |= ATTR_BOLD;
579 break;
580 case 4:
581 term.c.attr.mode |= ATTR_UNDERLINE;
582 break;
583 case 7:
584 term.c.attr.mode |= ATTR_REVERSE;
585 break;
586 case 22:
587 term.c.attr.mode &= ~ATTR_BOLD;
588 break;
589 case 24:
590 term.c.attr.mode &= ~ATTR_UNDERLINE;
591 break;
592 case 27:
593 term.c.attr.mode &= ~ATTR_REVERSE;
594 break;
595 case 39:
596 term.c.attr.fg = DefaultFG;
597 break;
598 case 49:
599 term.c.attr.fg = DefaultBG;
600 break;
601 default:
602 if(BETWEEN(attr[i], 30, 37))
603 term.c.attr.fg = attr[i] - 30;
604 else if(BETWEEN(attr[i], 40, 47))
605 term.c.attr.bg = attr[i] - 40;
606 else
607 fprintf(stderr, "erresc: gfx attr %d unkown\n", attr[i]);
608 break;
609 }
610 }
611 }
612
613 void
614 tsetscroll(int t, int b) {
615 int temp;
616
617 LIMIT(t, 0, term.row-1);
618 LIMIT(b, 0, term.row-1);
619 if(t > b) {
620 temp = t;
621 t = b;
622 b = temp;
623 }
624 term.top = t;
625 term.bot = b;
626 }
627
628 void
629 csihandle(void) {
630 switch(escseq.mode) {
631 default:
632 unknown:
633 printf("erresc: unknown csi ");
634 csidump();
635 /* die(""); */
636 break;
637 case '@': /* ICH -- Insert <n> blank char */
638 DEFAULT(escseq.arg[0], 1);
639 tinsertblank(escseq.arg[0]);
640 break;
641 case 'A': /* CUU -- Cursor <n> Up */
642 case 'e':
643 DEFAULT(escseq.arg[0], 1);
644 tmoveto(term.c.x, term.c.y-escseq.arg[0]);
645 break;
646 case 'B': /* CUD -- Cursor <n> Down */
647 DEFAULT(escseq.arg[0], 1);
648 tmoveto(term.c.x, term.c.y+escseq.arg[0]);
649 break;
650 case 'C': /* CUF -- Cursor <n> Forward */
651 case 'a':
652 DEFAULT(escseq.arg[0], 1);
653 tmoveto(term.c.x+escseq.arg[0], term.c.y);
654 break;
655 case 'D': /* CUB -- Cursor <n> Backward */
656 DEFAULT(escseq.arg[0], 1);
657 tmoveto(term.c.x-escseq.arg[0], term.c.y);
658 break;
659 case 'E': /* CNL -- Cursor <n> Down and first col */
660 DEFAULT(escseq.arg[0], 1);
661 tmoveto(0, term.c.y+escseq.arg[0]);
662 break;
663 case 'F': /* CPL -- Cursor <n> Up and first col */
664 DEFAULT(escseq.arg[0], 1);
665 tmoveto(0, term.c.y-escseq.arg[0]);
666 break;
667 case 'G': /* CHA -- Move to <col> */
668 case '`': /* XXX: HPA -- same? */
669 DEFAULT(escseq.arg[0], 1);
670 tmoveto(escseq.arg[0]-1, term.c.y);
671 break;
672 case 'H': /* CUP -- Move to <row> <col> */
673 case 'f': /* XXX: HVP -- same? */
674 DEFAULT(escseq.arg[0], 1);
675 DEFAULT(escseq.arg[1], 1);
676 tmoveto(escseq.arg[1]-1, escseq.arg[0]-1);
677 break;
678 /* XXX: (CSI n I) CHT -- Cursor Forward Tabulation <n> tab stops */
679 case 'J': /* ED -- Clear screen */
680 switch(escseq.arg[0]) {
681 case 0: /* below */
682 tclearregion(term.c.x, term.c.y, term.col-1, term.row-1);
683 break;
684 case 1: /* above */
685 tclearregion(0, 0, term.c.x, term.c.y);
686 break;
687 case 2: /* all */
688 tclearregion(0, 0, term.col-1, term.row-1);
689 break;
690 case 3: /* XXX: erase saved lines (xterm) */
691 default:
692 goto unknown;
693 }
694 break;
695 case 'K': /* EL -- Clear line */
696 switch(escseq.arg[0]) {
697 case 0: /* right */
698 tclearregion(term.c.x, term.c.y, term.col-1, term.c.y);
699 break;
700 case 1: /* left */
701 tclearregion(0, term.c.y, term.c.x, term.c.y);
702 break;
703 case 2: /* all */
704 tclearregion(0, term.c.y, term.col-1, term.c.y);
705 break;
706 }
707 break;
708 case 'S': /* SU -- Scroll <n> line up */
709 DEFAULT(escseq.arg[0], 1);
710 tscrollup(escseq.arg[0]);
711 break;
712 case 'T': /* SD -- Scroll <n> line down */
713 DEFAULT(escseq.arg[0], 1);
714 tscrolldown(escseq.arg[0]);
715 break;
716 case 'L': /* IL -- Insert <n> blank lines */
717 DEFAULT(escseq.arg[0], 1);
718 tinsertblankline(escseq.arg[0]);
719 break;
720 case 'l': /* RM -- Reset Mode */
721 if(escseq.priv) {
722 switch(escseq.arg[0]) {
723 case 1:
724 term.mode &= ~MODE_APPKEYPAD;
725 break;
726 case 7:
727 term.mode &= ~MODE_WRAP;
728 break;
729 case 12: /* att610 -- Stop blinking cursor (IGNORED) */
730 break;
731 case 25:
732 term.hidec = 1;
733 break;
734 case 1048: /* XXX: no alt. screen to erase/save */
735 case 1049:
736 tcursor(CURSOR_LOAD);
737 tclearregion(0, 0, term.col-1, term.row-1);
738 break;
739 default:
740 goto unknown;
741 }
742 } else {
743 switch(escseq.arg[0]) {
744 case 4:
745 term.mode &= ~MODE_INSERT;
746 break;
747 default:
748 goto unknown;
749 }
750 }
751 break;
752 case 'M': /* DL -- Delete <n> lines */
753 DEFAULT(escseq.arg[0], 1);
754 tdeleteline(escseq.arg[0]);
755 break;
756 case 'X': /* ECH -- Erase <n> char */
757 DEFAULT(escseq.arg[0], 1);
758 tclearregion(term.c.x, term.c.y, term.c.x + escseq.arg[0], term.c.y);
759 break;
760 case 'P': /* DCH -- Delete <n> char */
761 DEFAULT(escseq.arg[0], 1);
762 tdeletechar(escseq.arg[0]);
763 break;
764 /* XXX: (CSI n Z) CBT -- Cursor Backward Tabulation <n> tab stops */
765 case 'd': /* VPA -- Move to <row> */
766 DEFAULT(escseq.arg[0], 1);
767 tmoveto(term.c.x, escseq.arg[0]-1);
768 break;
769 case 'h': /* SM -- Set terminal mode */
770 if(escseq.priv) {
771 switch(escseq.arg[0]) {
772 case 1:
773 term.mode |= MODE_APPKEYPAD;
774 break;
775 case 7:
776 term.mode |= MODE_WRAP;
777 break;
778 case 12: /* att610 -- Start blinking cursor (IGNORED) */
779 break;
780 case 25:
781 term.hidec = 0;
782 break;
783 case 1048:
784 case 1049: /* XXX: no alt. screen to erase/save */
785 tcursor(CURSOR_SAVE);
786 tclearregion(0, 0, term.col-1, term.row-1);
787 break;
788 default: goto unknown;
789 }
790 } else {
791 switch(escseq.arg[0]) {
792 case 4:
793 term.mode |= MODE_INSERT;
794 break;
795 default: goto unknown;
796 }
797 };
798 break;
799 case 'm': /* SGR -- Terminal attribute (color) */
800 tsetattr(escseq.arg, escseq.narg);
801 break;
802 case 'r': /* DECSTBM -- Set Scrolling Region */
803 if(escseq.priv)
804 goto unknown;
805 else {
806 DEFAULT(escseq.arg[0], 1);
807 DEFAULT(escseq.arg[1], term.row);
808 tsetscroll(escseq.arg[0]-1, escseq.arg[1]-1);
809 }
810 break;
811 case 's': /* DECSC -- Save cursor position (ANSI.SYS) */
812 tcursor(CURSOR_SAVE);
813 break;
814 case 'u': /* DECRC -- Restore cursor position (ANSI.SYS) */
815 tcursor(CURSOR_LOAD);
816 break;
817 }
818 }
819
820 void
821 csidump(void) {
822 int i;
823 printf("ESC [ %s", escseq.priv ? "? " : "");
824 if(escseq.narg)
825 for(i = 0; i < escseq.narg; i++)
826 printf("%d ", escseq.arg[i]);
827 if(escseq.mode)
828 putchar(escseq.mode);
829 putchar('\n');
830 }
831
832 void
833 csireset(void) {
834 memset(&escseq, 0, sizeof(escseq));
835 }
836
837 void
838 tputtab(void) {
839 int space = TAB - term.c.x % TAB;
840
841 if(term.c.x + space >= term.col)
842 space--;
843
844 for(; space > 0; space--)
845 tmovecursor(CURSOR_RIGHT);
846 }
847
848 void
849 tputc(char c) {
850 if(term.esc & ESC_START) {
851 if(term.esc & ESC_CSI) {
852 escseq.buf[escseq.len++] = c;
853 if(BETWEEN(c, 0x40, 0x7E) || escseq.len >= ESC_BUF_SIZ) {
854 term.esc = 0;
855 csiparse(), csihandle();
856 }
857 } else if(term.esc & ESC_OSC) {
858 if(c == ';') {
859 term.titlelen = 0;
860 term.esc = ESC_START | ESC_TITLE;
861 }
862 } else if(term.esc & ESC_TITLE) {
863 if(c == '\a' || term.titlelen+1 >= ESC_TITLE_SIZ) {
864 term.esc = 0;
865 term.title[term.titlelen] = '\0';
866 XStoreName(xw.dis, xw.win, term.title);
867 } else {
868 term.title[term.titlelen++] = c;
869 }
870 } else if(term.esc & ESC_ALTCHARSET) {
871 switch(c) {
872 case '0': /* Line drawing crap */
873 term.c.attr.mode |= ATTR_GFX;
874 break;
875 case 'B': /* Back to regular text */
876 term.c.attr.mode &= ~ATTR_GFX;
877 break;
878 default:
879 printf("esc unhandled charset: ESC ( %c\n", c);
880 }
881 term.esc = 0;
882 } else {
883 switch(c) {
884 case '[':
885 term.esc |= ESC_CSI;
886 break;
887 case ']':
888 term.esc |= ESC_OSC;
889 break;
890 case '(':
891 term.esc |= ESC_ALTCHARSET;
892 break;
893 case 'A':
894 tmoveto(term.c.x, term.c.y-1);
895 term.esc = 0;
896 break;
897 case 'B':
898 tmoveto(term.c.x, term.c.y+1);
899 term.esc = 0;
900 break;
901 case 'C':
902 tmoveto(term.c.x+1, term.c.y);
903 term.esc = 0;
904 break;
905 case 'D': /* XXX: CUP (VT100) or IND (VT52) ... */
906 tmoveto(term.c.x-1, term.c.y);
907 term.esc = 0;
908 break;
909 case 'E': /* NEL -- Next line */
910 tnewline();
911 term.esc = 0;
912 break;
913 case 'M': /* RI -- Reverse index */
914 if(term.c.y == term.top)
915 tscrolldown(1);
916 else
917 tmoveto(term.c.x, term.c.y-1);
918 term.esc = 0;
919 break;
920 case 'c': /* RIS -- Reset to inital state */
921 treset();
922 term.esc = 0;
923 break;
924 case '=': /* DECPAM */
925 term.mode |= MODE_APPKEYPAD;
926 term.esc = 0;
927 break;
928 case '>': /* DECPNM */
929 term.mode &= ~MODE_APPKEYPAD;
930 term.esc = 0;
931 break;
932 case '7':
933 tcursor(CURSOR_SAVE);
934 term.esc = 0;
935 break;
936 case '8':
937 tcursor(CURSOR_LOAD);
938 term.esc = 0;
939 break;
940 default:
941 fprintf(stderr, "erresc: unknown sequence ESC 0x%02X '%c'\n", c, isprint(c)?c:'.');
942 term.esc = 0;
943 }
944 }
945 } else {
946 switch(c) {
947 case '\t':
948 tputtab();
949 break;
950 case '\b':
951 tmovecursor(CURSOR_LEFT);
952 break;
953 case '\r':
954 tmoveto(0, term.c.y);
955 break;
956 case '\n':
957 tnewline();
958 break;
959 case '\a':
960 xbell();
961 break;
962 case '\033':
963 csireset();
964 term.esc = ESC_START;
965 break;
966 default:
967 tsetchar(c);
968 tmovecursor(CURSOR_RIGHT);
969 break;
970 }
971 }
972 }
973
974 void
975 tputs(char *s, int len) {
976 for(; len > 0; len--)
977 tputc(*s++);
978 }
979
980 void
981 tresize(int col, int row) {
982 int i;
983 Line *line;
984 int minrow = MIN(row, term.row);
985 int mincol = MIN(col, term.col);
986
987 if(col < 1 || row < 1)
988 return;
989 /* alloc */
990 line = calloc(row, sizeof(Line));
991 for(i = 0 ; i < row; i++)
992 line[i] = calloc(col, sizeof(Glyph));
993 /* copy */
994 for(i = 0 ; i < minrow; i++)
995 memcpy(line[i], term.line[i], mincol * sizeof(Glyph));
996 /* free */
997 for(i = 0; i < term.row; i++)
998 free(term.line[i]);
999 free(term.line);
1000
1001 LIMIT(term.c.x, 0, col-1);
1002 LIMIT(term.c.y, 0, row-1);
1003 LIMIT(term.top, 0, row-1);
1004 LIMIT(term.bot, 0, row-1);
1005
1006 term.bot = row-1;
1007 term.line = line;
1008 term.col = col, term.row = row;
1009 }
1010
1011 unsigned long
1012 xgetcol(const char *s) {
1013 XColor color;
1014 Colormap cmap = DefaultColormap(xw.dis, xw.scr);
1015
1016 if(!XAllocNamedColor(xw.dis, cmap, s, &color, &color)) {
1017 color.pixel = WhitePixel(xw.dis, xw.scr);
1018 fprintf(stderr, "Could not allocate color '%s'\n", s);
1019 }
1020 return color.pixel;
1021 }
1022
1023 void
1024 xclear(int x1, int y1, int x2, int y2) {
1025 XSetForeground(xw.dis, dc.gc, dc.col[DefaultBG]);
1026 XFillRectangle(xw.dis, xw.buf, dc.gc,
1027 x1 * xw.cw, y1 * xw.ch,
1028 (x2-x1+1) * xw.cw, (y2-y1+1) * xw.ch);
1029 }
1030
1031 void
1032 xhints(void)
1033 {
1034 XClassHint chint = {TNAME, TNAME};
1035 XWMHints wmhint = {.flags = InputHint, .input = 1};
1036 XSizeHints shint = {
1037 .flags = PSize | PResizeInc,
1038 .height = xw.h, /* XXX: doesn't seem to work, see run() */
1039 .width = xw.w,
1040 .height_inc = xw.ch,
1041 .width_inc = xw.cw,
1042 };
1043 XSetWMProperties(xw.dis, xw.win, NULL, NULL, NULL, 0, &shint, &wmhint, &chint);
1044 }
1045
1046 void
1047 xinit(void) {
1048 int i;
1049
1050 xw.dis = XOpenDisplay(NULL);
1051 xw.scr = XDefaultScreen(xw.dis);
1052 if(!xw.dis)
1053 die("Can't open display\n");
1054
1055 /* font */
1056 if(!(dc.font = XLoadQueryFont(xw.dis, FONT)) || !(dc.bfont = XLoadQueryFont(xw.dis, BOLDFONT)))
1057 die("Can't load font %s\n", dc.font ? BOLDFONT : FONT);
1058
1059 /* XXX: Assuming same size for bold font */
1060 xw.cw = dc.font->max_bounds.rbearing - dc.font->min_bounds.lbearing;
1061 xw.ch = dc.font->ascent + dc.font->descent;
1062
1063 /* colors */
1064 for(i = 0; i < LEN(colorname); i++)
1065 dc.col[i] = xgetcol(colorname[i]);
1066
1067 term.c.attr.fg = DefaultFG;
1068 term.c.attr.bg = DefaultBG;
1069 term.c.attr.mode = ATTR_NULL;
1070 /* windows */
1071 xw.h = term.row * xw.ch + 2*BORDER;
1072 xw.w = term.col * xw.cw + 2*BORDER;
1073 xw.win = XCreateSimpleWindow(xw.dis, XRootWindow(xw.dis, xw.scr), 0, 0,
1074 xw.w, xw.h, 0,
1075 dc.col[DefaultBG],
1076 dc.col[DefaultBG]);
1077 xw.bufw = xw.w - 2*BORDER;
1078 xw.bufh = xw.h - 2*BORDER;
1079 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1080 /* gc */
1081 dc.gc = XCreateGC(xw.dis, xw.win, 0, NULL);
1082 XMapWindow(xw.dis, xw.win);
1083 xhints();
1084 XStoreName(xw.dis, xw.win, TNAME);
1085 XSync(xw.dis, 0);
1086 }
1087
1088 void
1089 xdraws(char *s, Glyph base, int x, int y, int len) {
1090 unsigned long xfg, xbg;
1091 int winx = x*xw.cw, winy = y*xw.ch + dc.font->ascent, width = len*xw.cw;
1092 int i;
1093
1094 if(base.mode & ATTR_REVERSE)
1095 xfg = dc.col[base.bg], xbg = dc.col[base.fg];
1096 else
1097 xfg = dc.col[base.fg], xbg = dc.col[base.bg];
1098
1099 XSetBackground(xw.dis, dc.gc, xbg);
1100 XSetForeground(xw.dis, dc.gc, xfg);
1101
1102 if(base.mode & ATTR_GFX)
1103 for(i = 0; i < len; i++)
1104 s[i] = gfx[s[i]];
1105
1106 XSetFont(xw.dis, dc.gc, base.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1107 XDrawImageString(xw.dis, xw.buf, dc.gc, winx, winy, s, len);
1108
1109 if(base.mode & ATTR_UNDERLINE)
1110 XDrawLine(xw.dis, xw.buf, dc.gc, winx, winy+1, winx+width-1, winy+1);
1111 }
1112
1113 void
1114 xcursor(int mode) {
1115 static int oldx = 0;
1116 static int oldy = 0;
1117 Glyph g = {' ', ATTR_NULL, DefaultBG, DefaultCS, 0};
1118
1119 LIMIT(oldx, 0, term.col-1);
1120 LIMIT(oldy, 0, term.row-1);
1121
1122 if(term.line[term.c.y][term.c.x].state & GLYPH_SET)
1123 g.c = term.line[term.c.y][term.c.x].c;
1124
1125 /* remove the old cursor */
1126 if(term.line[oldy][oldx].state & GLYPH_SET)
1127 xdraws(&term.line[oldy][oldx].c, term.line[oldy][oldx], oldx, oldy, 1);
1128 else
1129 xclear(oldx, oldy, oldx, oldy);
1130
1131 /* draw the new one */
1132 if(mode == CURSOR_DRAW) {
1133 xdraws(&g.c, g, term.c.x, term.c.y, 1);
1134 oldx = term.c.x, oldy = term.c.y;
1135 }
1136 }
1137
1138
1139 #ifdef DEBUG
1140 /* basic drawing routines */
1141 void
1142 xdrawc(int x, int y, Glyph g) {
1143 XRectangle r = { x * xw.cw, y * xw.ch, xw.cw, xw.ch };
1144 XSetBackground(xw.dis, dc.gc, dc.col[g.bg]);
1145 XSetForeground(xw.dis, dc.gc, dc.col[g.fg]);
1146 XSetFont(xw.dis, dc.gc, g.mode & ATTR_BOLD ? dc.bfont->fid : dc.font->fid);
1147 XDrawImageString(xw.dis, xw.buf, dc.gc, r.x, r.y+dc.font->ascent, &g.c, 1);
1148 }
1149
1150 void
1151 draw_(int dummy) {
1152 int x, y;
1153
1154 xclear(0, 0, term.col-1, term.row-1);
1155 for(y = 0; y < term.row; y++)
1156 for(x = 0; x < term.col; x++)
1157 if(term.line[y][x].state & GLYPH_SET)
1158 xdrawc(x, y, term.line[y][x]);
1159
1160 if(!term.hidec)
1161 xcursor(CURSOR_DRAW);
1162 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1163 XFlush(xw.dis);
1164 }
1165 #endif
1166
1167 void
1168 draw(int redraw_all) {
1169 int i, x, y, ox;
1170 Glyph base, new;
1171 char buf[DRAW_BUF_SIZ];
1172
1173 for(y = 0; y < term.row; y++) {
1174 base = term.line[y][0];
1175 i = ox = 0;
1176 for(x = 0; x < term.col; x++) {
1177 new = term.line[y][x];
1178 if(!ATTRCMP(base, new) && i < DRAW_BUF_SIZ)
1179 buf[i++] = new.c;
1180 else {
1181 xdraws(buf, base, ox, y, i);
1182 buf[0] = new.c;
1183 i = 1;
1184 ox = x;
1185 base = new;
1186 }
1187 }
1188 xdraws(buf, base, ox, y, i);
1189 }
1190 xcursor(term.hidec ? CURSOR_HIDE : CURSOR_DRAW);
1191 XCopyArea(xw.dis, xw.buf, xw.win, dc.gc, 0, 0, xw.bufw, xw.bufh, BORDER, BORDER);
1192 XFlush(xw.dis);
1193 }
1194
1195 void
1196 expose(XEvent *ev) {
1197 draw(SCREEN_REDRAW);
1198 }
1199
1200 char*
1201 kmap(KeySym k) {
1202 int i;
1203 for(i = 0; i < LEN(key); i++)
1204 if(key[i].k == k)
1205 return (char*)key[i].s;
1206 return NULL;
1207 }
1208
1209 void
1210 kpress(XEvent *ev) {
1211 XKeyEvent *e = &ev->xkey;
1212 KeySym ksym;
1213 char buf[32];
1214 char *customkey;
1215 int len;
1216 int meta;
1217 int shift;
1218
1219 meta = e->state & Mod1Mask;
1220 shift = e->state & ShiftMask;
1221 len = XLookupString(e, buf, sizeof(buf), &ksym, NULL);
1222
1223 if(customkey = kmap(ksym))
1224 ttywrite(customkey, strlen(customkey));
1225 else if(len > 0) {
1226 buf[sizeof(buf)-1] = '\0';
1227 if(meta && len == 1)
1228 ttywrite("\033", 1);
1229 ttywrite(buf, len);
1230 } else
1231 switch(ksym) {
1232 case XK_Up:
1233 case XK_Down:
1234 case XK_Left:
1235 case XK_Right:
1236 sprintf(buf, "\033%c%c", term.mode & MODE_APPKEYPAD ? 'O' : '[', "DACB"[ksym - XK_Left]);
1237 ttywrite(buf, 3);
1238 break;
1239 case XK_Insert:
1240 if(shift)
1241 draw(1), puts("draw!")/* XXX: paste X clipboard */;
1242 break;
1243 default:
1244 fprintf(stderr, "errkey: %d\n", (int)ksym);
1245 break;
1246 }
1247 }
1248
1249 void
1250 resize(XEvent *e) {
1251 int col, row;
1252
1253 if(e->xconfigure.width == xw.w && e->xconfigure.height == xw.h)
1254 return;
1255
1256 xw.w = e->xconfigure.width;
1257 xw.h = e->xconfigure.height;
1258 xw.bufw = xw.w - 2*BORDER;
1259 xw.bufh = xw.h - 2*BORDER;
1260 col = xw.bufw / xw.cw;
1261 row = xw.bufh / xw.ch;
1262 tresize(col, row);
1263 ttyresize(col, row);
1264 XFreePixmap(xw.dis, xw.buf);
1265 xw.buf = XCreatePixmap(xw.dis, xw.win, xw.bufw, xw.bufh, XDefaultDepth(xw.dis, xw.scr));
1266 draw(SCREEN_REDRAW);
1267 }
1268
1269 void
1270 run(void) {
1271 XEvent ev;
1272 fd_set rfd;
1273 int xfd = XConnectionNumber(xw.dis);
1274
1275 running = 1;
1276 XSelectInput(xw.dis, xw.win, ExposureMask | KeyPressMask | StructureNotifyMask);
1277 XResizeWindow(xw.dis, xw.win, xw.w, xw.h); /* XXX: fix resize bug in wmii (?) */
1278
1279 while(running) {
1280 FD_ZERO(&rfd);
1281 FD_SET(cmdfd, &rfd);
1282 FD_SET(xfd, &rfd);
1283 if(select(MAX(xfd, cmdfd)+1, &rfd, NULL, NULL, NULL) == -1) {
1284 if(errno == EINTR)
1285 continue;
1286 die("select failed: %s\n", SERRNO);
1287 }
1288 if(FD_ISSET(cmdfd, &rfd)) {
1289 ttyread();
1290 draw(SCREEN_UPDATE);
1291 }
1292 while(XPending(xw.dis)) {
1293 XNextEvent(xw.dis, &ev);
1294 if(handler[ev.type])
1295 (handler[ev.type])(&ev);
1296 }
1297 }
1298 }
1299
1300 int
1301 main(int argc, char *argv[]) {
1302 if(argc == 2 && !strncmp("-v", argv[1], 3))
1303 die("st-" VERSION ", © 2009 st engineers\n");
1304 else if(argc != 1)
1305 die("usage: st [-v]\n");
1306 setlocale(LC_CTYPE, "");
1307 tnew(80, 24);
1308 ttynew();
1309 xinit();
1310 run();
1311 return 0;
1312 }